extremely frightened

I stood petrified as the most enormous dog I've ever seen came bounding up to me. 当我平生所见到的最大的一只狗向我扑来的时候，我吓得呆在那里一动不动。

She's petrified of being on her own in the house at night. 她晚上一个人在家被吓坏了。

having changed to a substance like stone

a petrified tree/shell 石化树／壳

used to describe something that has stopped changing and developing, and often belongs to the past